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PbO–CaF 2 –P 2 O 5 glasses containing small concentrations of CuO from 0 to 0.6mol% were prepared. A number of studies viz., dielectric studies (constant ɛ′, loss tanδ, ac conductivity σ ac over a range of frequency and temperature), infrared, optical absorption ESR and photoluminescence spectra of these glasses, have been carried out. The variations observed in all...